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my $item = db::Inventory::Item->retrieve( 15 );
if( $item ) {
  $item->quantity( 15 );
}

-- Oracle: 
INSERT INTO my_table 
...
-- Postgres:
INSERT INTO my_table
VALUES( nextval( 'my_sequence' ), 'Some Value' );

--MySQL
INSERT INTO my_table( seq_field, val_field )
...
INSERT INTO my_table( val_field )
VALUES ( 'Some Value' );
SELECT SCOPE_IDENTITY();

my $newRecord = db::Table->create( { val_field => 'Some Value' } );